A rouge is a clanless cat that causes trouble to the clans. They either were exiled from a clan, threaten or steal their prey, threaten boarders, harm cats, or other things. They are different from loners, who don't cause trouble to the clan cats. Sometimes rouges will join together with other rouges for a better chance at survival in their cruel world.
Rouges usually live anywhere, but are more often seen dodging cars and the jaws of dogs in Twolegplace, where they knock over silver containers to get Twoleg food when prey is scarce.